**Give a geographical reason:**

Population density is a function of the population and area of a region.

#### Solution

- The number of people living in an area or country is called the total population of the area or country.

- The density of the population is the ratio between the total population and a total area of that region or country.

- For example, as per the census of 2011, the Density of population in India is 325 persons per sq. km. It is a ratio between the total population in India and the total area of India in sq. km.

- In some countries, the total population may be less but the density of the population is high due to small area of the country. For example, Bangladesh's total population is less but the area of the country is small, therefore, the density of the population is high.

- In some countries total population may be more but the density of the population is low due to the very large area of the country. For example, Brazil has more total population but the area of the country is also large, therefore, the density of the population is low.

Thus, population density is a function of the population and area of a region.